Are you saying that when trying to buy players, between two teams you manage. You are unable to purchase players from the level 8 side above a 1* rating? Because if that is the case, then obviously you wont be able to purchase your 4,5,6* rated players for a team that's 4 levels below. That would make those level 8 players in a level 4 side potentially 7,8,9* players. Which by all other means are not available to any other manager at that level.
The highest rated players available on any level should be players rated at a maximum of 6*. Those rated any higher have been power trained either through token purchase (converted into skill points) or buy excessive training.
Any other way of obtaining players or traing them is not possible unless its some sort of unknown cheat..